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"It looked like the moon was coming over the mountain - but then turned into something totally different."

As yet, no one has come forward to claim the phenomenon as a hoax, nor have scientists or military experts been able to explain the light show.

One theory is that it may have been a light show laser projected onto low clouds, but the dawn timing and large scale of the display makes it unlikely.

Stargate fans claim it's a UFO entering the Earth's atomosphere through a wormhole, and say it explains how UFOs seemingly appear and disappear at random in our skies.

One of the most popular conspiracy theories links the phenomenon to the Large Hadron Collider in Switzerland and rumours of a "Blackhole Project" under way at the giant underground atom-smasher.

Norwegian Space Centre chief Scientist Erik Tandberg told The Sun he agreed with many experts who believed it may have been a missile test from Russia, although Russia has quickly moved to deny any such testing.

"I agree with everyone in the science community that this light was the weirdest thing. I have never seen anything like this ever," he said.

"The spiral suggests the object came off course and balance and entered the spiral movement. Leaking rocket fuel could account for the blue light.

"But I know that the military have denied this explanation. So we could be looking at an entirely new natural phenomenon."